installation of convert top 63 dart

Thanks for your photo and the mention of no screws in the area boxed . I do have a question...if the portion of the top is to be put on the well side do you have to cut the fabric to cross over to the outside of the belt line?....without cutting a vertical cut of about one inch to enable the edge material to be long enough to be secured, I cannot pull the material that goes over the body edge to be fastened under the retainer... Am I missing something?